To put the iPhone into DFU mode so you can do an iTunes firmware restore follow these steps:
Step One
Open iTunes and connect the iPhone to your PC or Mac.
Open iTunes and connect the iPhone to your PC or Mac.
Step Two
Press and hold the Home button and the Sleep/Wake button at the same time.
Press and hold the Home button and the Sleep/Wake button at the same time.
Step Three
After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
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